Listing the vehicle as a “mobile computing device,” the law would hypothetically protect automakers from pesky owners looking to alter any sort of technology in the vehicle that relates to the onboard computer. Flashing your ECU would be a big no no, which could also lead to all sorts of problems for aftermarket shops.
What GM, and even tractor companies like John Deere, argues is that you, as an owner, don’t actually own your car. Rather, you’re sort of just borrowing it for an extended amount of time and paying for the rights to use the technology. If it sounds ridiculous— it is. But it gets even more ludicrous.
According to the Electronic Frontier Foundation, John Deere argued that “letting people modify car computer systems will result in them pirating music through the on-board entertainment system.”